Lyme disease is now the most common tick-borne infection in the USA, with 27,444 cases reported to the CDC in 2007, up from fewer than 10,000 cases in the early 1990s. It's reported year-round, with cases starting to increase in early spring and peaking in summer. Scientists at Yale reported Tuesday that global warming could change the ticks' feeding patterns in cold regions, resulting in more persistent strains of bacteria and more severe infections.

Someone in your house have the sniffles? Watch out for the refrigerator door handle. The TV remote, too. A new study finds that cold sufferers often leave their germs there, where they can live for two days or longer.

Someone in your house have the sniffles? Watch out for the refrigerator door handle. The TV remote, too. A new study finds that cold sufferers often leave their germs there, where they can live for two days or longer.